WO2000073693A1 - Procede et appareil de revetement de conduite - Google Patents

Procede et appareil de revetement de conduite Download PDF

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Publication number
WO2000073693A1
WO2000073693A1 PCT/GB2000/002043 GB0002043W WO0073693A1 WO 2000073693 A1 WO2000073693 A1 WO 2000073693A1 GB 0002043 W GB0002043 W GB 0002043W WO 0073693 A1 WO0073693 A1 WO 0073693A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
weld seam
guillotine
applying
roller
Prior art date
Application number
PCT/GB2000/002043
Other languages
English (en)
Inventor
Alan Gregory Lane
Original Assignee
Bredero Price Coaters Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bredero Price Coaters Limited filed Critical Bredero Price Coaters Limited
Priority to AU47726/00A priority Critical patent/AU4772600A/en
Publication of WO2000073693A1 publication Critical patent/WO2000073693A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
    • B29C63/04—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like
    • B29C63/048—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like specially adapted for articles having local protrusions, e.g. tubes having a bead weld
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
    • F16L58/1063—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sheet wrapped around the pipe

Definitions

  • This invention relates to a pipe coating method and apparatus and, more particularly, to a method and apparatus for applying a coating to a weld seam on a pipe.
  • Underwater pipelines are most frequently used for transporting hydrocarbons from the off-shore reservoirs to shore. With such substances, it is important that the temperature within the pipeline does not fall below a certain level, otherwise hydrate and wax formation and deposition occur. The temperature of the hydrocarbons increases with the depth of the reservoirs. In the transportation of such materials it is necessary to prevent heat loss from the hydrocarbons and this is generally addressed by providing an insulating coating around the pipeline.
  • Underwater pipelines may also require a weight coating for several purposes including the need to weigh the pipeline down and so maintain the position of the pipe on the seabed and to form a protective cover around the pipeline.
  • the pipe is coated with extruded polyethylene or polypropylene together with one or more additional coatings to provide weight or anti-corrosion properties to the pipeline.
  • the thickness of coating on the weld seam as opposed to a point perpendicular to the seam will most certainly vary, the lowest measurement will be found on the weld.
  • the degree of difference between the two measurements depends primarily on the height and width of the weld.
  • the first disadvantage is that it is not adaptable for use on spiral welded pipe comparing the increase in thickness on spiral welded pipe to longitudinal welded pipe with the same parameters (weld shape etc) .
  • a gain in thickness on the spiral pipe is expected to be in the region of 20% of the gain attained on the longitudinal pipe.
  • the second disadvantage of the known "stretch and pull" method is that unless the adjustment and speeds are precisely controlled there will always be a variation in the thicknesses around the pipe girth due to the difficulty in obtaining two different constant speeds of material between the gear roller and the pipe.
  • the waste % will be dependent on the lowest measured thickness on the pipe (be it on the body or weld) and it is often found with this system that the lowest point on the pipe is located just after the weld at the point where the gear roller finishes its high speed cycle.
  • a powder application unit for applying powder to the surface of the PE coated pipes destined for concrete coating.
  • This unit is linked to a timing device as to deposit a layer of powder as the weld passed.
  • the unit functions as it was designed to however it is found that where sufficient powder is deposited to give any appreciable increase in coating thickness, voids or pockets of un-melted powder are discovered.
  • Another problem with the system would be to overcome the problem of depositing enough material on the weld to give the desired increase in thickness.
  • an apparatus for applying a patch of material over the weld seam of a pipe comprising means for advancing the material towards the pipe, means for sensing the position of a weld seam on the pipe, means for applying the material onto the pipe, over the weld seam and means for cutting the material to the required length to cover the weld seam.
  • the means for advancing the material through the apparatus comprises a plurality of rollers through which the material passes and a motor for operating the rollers.
  • the rollers may be chain-driven.
  • the rollers may be adapted to contact the upper and lower surfaces of the material in order to feed the material through the apparatus .
  • the cutting means comprises a guillotine provided on one end of the apparatus, adjacent the pipe.
  • the guillotine may be mounted within a support cradle which is mounted on the end of the apparatus.
  • the guillotine is provided with a solenoid for actuation thereof.
  • the solenoid is provided with a sensor which, when activated passes a signal to the solenoid to lower or raise the guillotine accordingly.
  • the apparatus is provided with an indented seat to receive the guillotine when in an extended position. This provides a secure and firm support for the guillotine during the cutting operation.
  • the means to apply the material to the pipe comprises a roller mounted on the apparatus, the roller being moveable between a retracted position when not in use and an extended position when applying material to the weld seam.
  • the roller is mounted on the free end of a cylinder.
  • the cylinder is either hydraulic or pneumatic.
  • the cylinder may be replaced by an actuating arm upon which the roller is mounted.
  • the apparatus is provided with a control panel to enable an operator to control the functions of the apparatus.
  • a method of applying a patch of material over the weld seam of a rotating pipe comprising the steps of advancing a sheet of material towards the pipe, sensing the presence of a weld seam on the pipe, applying the free end of the material to the pipe, pressing the material over the weld seam and cutting the material to the required length to cover the weld seam.
  • the surface temperature of the pipe during the application method is in the range of 180 °C to 210°C.
  • the pipe is pre-coated with a layer of fusion bonded epoxy.
  • the fusion bonded epoxy is applied to the surface of the pipe via a spray head.
  • the material is applied to the pipe at ambient temperature .
  • the primary coat is applied to the pipe at a temperature in the range 180°C to 220°C.
  • Figure 1 is a schematic side view of an apparatus for coating a pipe according to one aspect of the present invention
  • Figure 2 is a schematic side view of the apparatus of Figure 1 .
  • Figure 3 is a schematic side view of the apparatus of Figure 1 following application of the coating, and.
  • Figure 4 is a plan view of a section of pipe having a longitudinal weld seam coated with the apparatus of Figure 1.
  • an apparatus 1 for applying a patch to the surface of a pipe in the region of the weld seam of the pipe comprising a housing 2 in which means are provided for supporting and advancing a sheet of material (not shown) to be applied to the surface of the pipe towards the rotating pipe as it passes the apparatus.
  • the housing will be manufactured from stainless steel. However, other suitable materials could be used.
  • a reel 3 is releasably supported within the housing at one end thereof, around which the sheet of material is wound.
  • a first motor 4 is provided for feeding the sheet of material from the reel 3 , to the end of the apparatus adjacent to the rotating pipe, and remote from the reel, prior to being fed onto the pipe.
  • a gravity loop system 5 may be incorporated to interact between the applicator 1 and the reel 3 as shown in Figure 2. This system allows the motor which feeds material into the applicator to be low powered.
  • the loop may be fitted with a number of sensors (not shown) to monitor correct operation.
  • the housing 2 is provided with one or more pairs of chain driven rollers 6 which are adapted to contact the sheet of material on both the upper and lower surfaces thereof and to feed the sheet of material through the housing.
  • the apparatus Adjacent the end of the housing remote from the reel, the apparatus is provided with a cutting means 7.
  • the cutting means comprises a support cradle (not shown) which is mounted on the housing.
  • a cutting device 8 which in the embodiment shown is a guillotine, is mounted on the free end of the support cradle for movement towards and away from the upper surface of the sheet of material .
  • the cradle may be suspended upon the housing through linear bearings from a twin shaft arrangement and is located by loading clamps.
  • a secondary motor (not shown) is mounted on the cradle, the purpose of which will be described below.
  • a solenoid 9 is mounted on the housing 2 for actuation of the guillotine.
  • the housing is provided with a seat 10, below the cutting means.
  • the seat is indented to accept the blade 8a of the cutting means when it is in the lowered position. This provides a firm support for the blade during the cutting operation.
  • the cradle may also incorporate a support tray (not shown) which is designed to slide under the fixed sections on the in-feed section and the applicator section, for patch length setting.
  • An actuator 11 which may be in the form of a hydraulic or pneumatic cylinder is mounted adjacent the cutting means, on the cradle.
  • a roller 12 is mounted on the free end of the actuator and is moveable towards and away from the surface of the rotating pipe as it passes the applicator.
  • An electrically operated solenoid 13 is operationally connected to the roller to control this movement of the actuator during use of the apparatus.
  • a cooling drum (not shown) is located on the apparatus to engage with the roller 12 when it is relocated as will be described below.
  • a plurality of sensors are mounted on the apparatus, for detecting correct operation.
  • a first sensor 14 is situated before the cutting means 7
  • a second sensor 15 is situated after the cutting means 7
  • a third sensor 16 is situated at the end of the applicator apparatus.
  • a control panel will be provided on the apparatus to allow personnel operating the apparatus to control the operating parameters during use.
  • the operation of the apparatus will now be described with reference to the Figures.
  • a sheet of suitable material such as polyethylene is wound around the reel 3 of the apparatus which is then loaded into the housing 2 of the applicator apparatus.
  • a signal is generated from the control panel to operate the apparatus to feed the sheet of material through the housing to the end of the applicator adjacent the cutting means 7. Once the end sensor H is activated, by the sheet of material, the feed signal will cease.
  • the applicator will now await a signal from the weld seam sensor.
  • a pipe is mounted onto the main coating apparatus and is rotated as it advances through the various stages of coating.
  • a pre-coat of fusion bonded epoxy is sprayed onto the surface of the pipe, which has a temperature in the range of approximately 180°C to 210°C.
  • a sensor locates the position of the weld seam and sends a signal to the applicator apparatus 1 to feed a length of the material from the apparatus past the cutting means 7.
  • a signal is also sent to activate the actuator 11 and extend the cylinder 12 mounted on the cradle. As the cylinder is extended this brings the roller 13 into contact with the upper surface of the sheet of material . The sheet is then pressed over the weld seam as the pipe rotates past the applicator apparatus.
  • the cutting means 7 is activated to lower the guillotine and sever the sheet of material at the required length to cover the weld seam.
  • the resulting patch of material will be in the region of around 20cm in length.
  • the length of the patch may be altered accordingly.
  • the cutting means 7 is then retracted and the roller 12 continues to apply pressure to the patch of material to firmly apply this over the weld seam.
  • the cylinder 11 carrying the roller 12 is retracted and the pipe rotates, with the patch applied over the weld seam, past the applicator apparatus.
  • the temperature of the roller increases due to the high temperature of the pipe and the coatings applied thereto.
  • the roller 12 engages with the cooling drum in order to lower the temperature of the roller before it is brought into contact with the next patch of material to be applied over the weld seam.
  • the first motor 4 will be reactivated to position the next strip of material at the end of the applicator ready for the next signal from the weld seam sensor.
  • the patch is applied to the surface of the weld seam at ambient temperature i.e. approximately 20°C.
  • each patch 19' is applied to the pipe offset circumferentially from the last patch. This gives rise to a pattern of patches as shown in figure 4 covering the spiral weld seam.
  • Such coatings may, for example, be spray applied, wound or moulded onto the pipe.
  • the weld seam 20,21 is covered by a patch of material and no longer stands proud of the surface of the pipe, when the further coatings are applied, the depth of the coatings can be uniformly controlled thereby resulting in savings of up to 40% on the coating materials.
  • the patches may be applied to the surface of the pipe either under the first layer of coating or may, alternatively, be provided between the various layers of coating as they are applied.
  • the position of the applicator 1 can be altered in order to apply the patches at different times in the coating process.
  • a level adjustment device will be incorporated in the apparatus for example by mounting the applicator structure on a floor mounted track with a suitable locking mechanism. Vertical movement of the apparatus may be achieved by hinging the applicator top section and providing a screw wheel manual adjuster.
  • Guarding will be provided on the apparatus where appropriate, for example in the region of the guillotine in order to provide for safe operation of the apparatus. Furthermore, a heat shield 17 may be provided on the apparatus in the region of the patch applicator.
  • the patches will be applied to the surface of the rotating pipe between 20 to 35 times per minute .

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un appareil (1) qui sert à appliquer une pièce (19, 19') de matériau sur la ligne de soudure d'une conduite et qui comprend un dispositif (6) servant à avancer le matériau en direction de la conduite, un dispositif de détection d'une ligne de soudure sur ladite conduite, un dispositif (12) servant à appliquer ledit matériau sur la conduite, par dessus la ligne de soudure, et un dispositif (7) conçu pour couper le matériau à la longueur requise afin de couvrir la ligne de soudure.
PCT/GB2000/002043 1999-05-26 2000-05-26 Procede et appareil de revetement de conduite WO2000073693A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU47726/00A AU4772600A (en) 1999-05-26 2000-05-26 Pipe coating method and apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9912109.7 1999-05-26
GBGB9912109.7A GB9912109D0 (en) 1999-05-26 1999-05-26 Pipe coating method and apparatus

Publications (1)

Publication Number Publication Date
WO2000073693A1 true WO2000073693A1 (fr) 2000-12-07

Family

ID=10854100

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/002043 WO2000073693A1 (fr) 1999-05-26 2000-05-26 Procede et appareil de revetement de conduite

Country Status (3)

Country Link
AU (1) AU4772600A (fr)
GB (1) GB9912109D0 (fr)
WO (1) WO2000073693A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003020494A1 (fr) * 2001-08-30 2003-03-13 Bredero Price Coaters Ltd Procede et appareil pour l'application continue d'un revetement externe sur un tuyau
US8038829B2 (en) 2006-02-22 2011-10-18 Shawcor Ltd. Coating method for pipe having weld bead
WO2018140935A1 (fr) * 2017-01-30 2018-08-02 National Oilwell Varco, L.P. Tuyau soudé renforcé, connexions filetées et leurs procédés de réalisation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0335784A1 (fr) * 1988-03-30 1989-10-04 Societe Industrielle D'isolation Et De Fournitures D'usines Procédé et dispositif pour le revêtement des tubes soudés
WO1995033953A2 (fr) * 1994-06-04 1995-12-14 Thomas Christopher Arnott Ameliorations apportees a l'isolation et a la protection anticorrosion de conduites
EP0601913B1 (fr) * 1992-12-09 1997-05-14 Isotub Coating Procédé et dispositif pour revêtir d'une enveloppe isolante un tube et tube obtenu par ce procédé

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0335784A1 (fr) * 1988-03-30 1989-10-04 Societe Industrielle D'isolation Et De Fournitures D'usines Procédé et dispositif pour le revêtement des tubes soudés
EP0601913B1 (fr) * 1992-12-09 1997-05-14 Isotub Coating Procédé et dispositif pour revêtir d'une enveloppe isolante un tube et tube obtenu par ce procédé
WO1995033953A2 (fr) * 1994-06-04 1995-12-14 Thomas Christopher Arnott Ameliorations apportees a l'isolation et a la protection anticorrosion de conduites

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003020494A1 (fr) * 2001-08-30 2003-03-13 Bredero Price Coaters Ltd Procede et appareil pour l'application continue d'un revetement externe sur un tuyau
US8038829B2 (en) 2006-02-22 2011-10-18 Shawcor Ltd. Coating method for pipe having weld bead
WO2018140935A1 (fr) * 2017-01-30 2018-08-02 National Oilwell Varco, L.P. Tuyau soudé renforcé, connexions filetées et leurs procédés de réalisation
US10961787B2 (en) 2017-01-30 2021-03-30 National Oilwell Varco, L.P. Enhanced welded pipe, threaded connections, and methods for achieving the same
US11174685B2 (en) 2017-01-30 2021-11-16 National Oilwell Varco, L.P. Enhanced welded pipe, threaded connections, and methods for achieving the same

Also Published As

Publication number Publication date
AU4772600A (en) 2000-12-18
GB9912109D0 (en) 1999-07-28

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